body {
    background-attachment: fixed;
}

body::after {
    content: '';
    position: fixed;
    bottom: 0;
    right: 0;
    width: 500px;
    height: 100%;
    background-image: url('../images/background.svg');
    background-position: bottom right;
    background-repeat: no-repeat;
    background-size: 500px auto;
    opacity: 0.3;
    z-index: -1;
}